如何通知组件由另一个组成的操作？

Question

我正在尝试使用此link's方法来通知组件在另一个组件上进行的操作。它建议在服务中添加Subject变量，调用next()方法并从需要通知的组件中订阅它。

问题是指向Subject<number>.asObservable()的订阅方法未触发。

方案是：表单组件使用TasklistResourcesService添加一行，然后在Http帖子之后，表单组件显示通知，服务将“间接”通知Grid组件已添加行。

表单组件：

submit({ value, valid }: { value: FormGroup, valid: boolean }) {
    if (value['userId']) {
      this.tasklistResourcesService.addResource(this.tasklist, +value['userId'])
        .subscribe(response => {
          if (response) {
            this.notification.success('Sucesso!', 'Cadastro realizado.');
          } else {
            this.notification.error('Erro!', 'Cadastro não realizado.');
          }
        },
        (err) => console.log(err));
    }

TasklistResourcesService

private resourceAddedSource = new Subject<number>();

  resourceAdded$ = this.resourceAddedSource.asObservable();

  constructor(
    private http: HttpClient
  ) { }

addResource(tasklistId: number, userId: number) {
    const observable = this.http
      .post<TasklistResource>(`${this.baseUrl}/${tasklistId}/resources`, {
        tasklistId: tasklistId,
        userId: userId
      }, { observe: 'response' }).share();

    observable.subscribe(response => {
      this.resourceAddedSource.next(userId);
    });

    return observable;
  }

网格组件

subscription: Subscription;

  constructor(
    private tasklistResourcesService: TasklistResourcesService,
    private notification: NotificationsService,
    private confirmation: ConfirmationService
  ) {
    this.subscription = tasklistResourcesService.resourceAdded$.subscribe(
      user => {
        this.refreshGrid();  // THIS ISN'T BEING CALLED
      }
    );
  }